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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |
Amortization of acquired above market lease values | $ 14,422 land_AmortizationOfAboveMarketLease |  | $ 9,027 land_AmortizationOfAboveMarketLease
Accumulated amortization of acquired above market lease values | 5,395 land_AboveMarketLeaseAccumulatedAmortization |  |
Accumulated amortization of acquired below market lease values | 217,337 us-gaap_BelowMarketLeaseAccumulatedAmortization | 162,194 us-gaap_BelowMarketLeaseAccumulatedAmortization | 162,194 us-gaap_BelowMarketLeaseAccumulatedAmortization
Amortization of acquired below market lease values | 55,143 us-gaap_AmortizationOfBelowMarketLease | 19,984 us-gaap_AmortizationOfBelowMarketLease |
Amortization expense related to intangibles assets | 279,118 us-gaap_AmortizationOfIntangibleAssets | 28,468 us-gaap_AmortizationOfIntangibleAssets |
Impairments recognized on real estate | 0 us-gaap_ImpairmentOfRealEstate |  |
Tenant improvements | 582,247 us-gaap_TenantImprovements |  | 582,247 us-gaap_TenantImprovements
Accrued interest on escrow funds | 510 us-gaap_IncreaseInRestrictedCash |  | 3,041 us-gaap_IncreaseInRestrictedCash
Restricted cash funds released date | Mar. 04, 2015 |  |
Restricted cash |  |  | 132,741 us-gaap_RestrictedCashAndCashEquivalents
Reserves or direct write-offs recorded | 0 us-gaap_ProvisionForDoubtfulAccounts |  |
Above-Market Lease Values [Member] |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |
Purchase price allocated to lease values in connection with the current-year acquisitions | 65,203 us-gaap_FiniteLivedIntangibleAssetAcquiredInPlaceLeases / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_AboveMarketLeasesMember |  | 65,203 us-gaap_FiniteLivedIntangibleAssetAcquiredInPlaceLeases / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_AboveMarketLeasesMember
Below-Market Lease Values [Member] |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |
Purchase price allocated to lease values in connection with the current-year acquisitions | 371,707 us-gaap_FiniteLivedIntangibleAssetAcquiredInPlaceLeases / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = land_BelowMarketLeaseMember |  | 371,707 us-gaap_FiniteLivedIntangibleAssetAcquiredInPlaceLeases / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = land_BelowMarketLeaseMember
Water Permit [Member] |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |
Restricted cash funds released date | Feb. 12, 2015 |  |
Restricted cash | 0 us-gaap_RestrictedCashAndCashEquivalents / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_UseRightsMember |  | 129,700 us-gaap_RestrictedCashAndCashEquivalents / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_UseRightsMember
Permit approved date | Jan. 27, 2015 |  |
Minimum [Member] |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |
Hypothetical expected lease-up periods for estimating carrying costs | 1 month |  |
Minimum [Member] | Leases Acquired in Place and Origination Cost [Member] |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |
Period of amortization for lease origination cost | 1 year |  |
Maximum [Member] |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |
Hypothetical expected lease-up periods for estimating carrying costs | 24 months |  |
Maximum [Member] | Leases Acquired in Place and Origination Cost [Member] |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |
Period of amortization for lease origination cost | 10 years |  |
Buildings and Improvements [Member] |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful life | 39 years |  |
Horticulture [Member] |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful life | 25 years |  |
Equipment and Fixtures [Member] | Minimum [Member] |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful life | 5 years |  |
Equipment and Fixtures [Member] | Maximum [Member] |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful life | 10 years |  |
Land, Buildings, Improvements and Horticulture [Member] |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |
Depreciation expense | 512,514 us-gaap_Depreciation / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandAndBuildingMember | 259,563 us-gaap_Depreciation / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandAndBuildingMember |
Tenant Improvements [Member] |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |
Depreciation expense | 14,398 us-gaap_Depreciation / us-gaap_PropertyPlantAndEquipmentByTypeAxis = land_TenantImprovementsMember | 0 us-gaap_Depreciation / us-gaap_PropertyPlantAndEquipmentByTypeAxis = land_TenantImprovementsMember |
Accumulated depreciation | $ 71,158 us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation / us-gaap_PropertyPlantAndEquipmentByTypeAxis = land_TenantImprovementsMember |  | $ 56,760 us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation / us-gaap_PropertyPlantAndEquipmentByTypeAxis = land_TenantImprovementsMember

X
- Definition Above market lease accumulated amortization. + References No definition available. + Details
Name: | land_AboveMarketLeaseAccumulatedAmortization
Namespace Prefix: | land_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amortization of Above Market Lease + References No definition available. + Details
Name: | land_AmortizationOfAboveMarketLease
Namespace Prefix: | land_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Escrow fund release date. + References No definition available. + Details
Name: | land_EscrowFundReleaseDate
Namespace Prefix: | land_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Expected lease up period. + References No definition available. + Details
Name: | land_ExpectedLeaseUpPeriod
Namespace Prefix: | land_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: | land_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Permit approved date. + References No definition available. + Details
Name: | land_PermitApprovedDate
Namespace Prefix: | land_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of amortization of acquired leases acquired as part of a real property acquisition at below market lease rate with a finite life. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | debit
Period Type: | duration

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- Definition Amount of accumulated amortization of leases acquired as part of a real property acquisition at below market lease rate with a finite life. + References No definition available. + Details
Name: | us-gaap_BelowMarketLeaseAccumulatedAmortization
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
Name: | us-gaap_Depreciation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition This element represents the amount of value allocated by a lessor (acquirer) to lease agreements which exist at acquisition of a leased property. Such amount may include the value assigned to existing tenant relationships and excludes the market adjustment component of the value assigned for above or below-market leases acquired. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Remaining amortization period of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition The charge against earnings in the period to reduce the carrying amount of real property to fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2921-110230 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of cash outflow associated with funds that are not available for withdrawal or use (such as funds held in escrow) and are associated with underlying transactions that are classified as investing activities. + References No definition available. + Details
Name: | us-gaap_IncreaseInRestrictedCash
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.5) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 5 -Article 5 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | debit
Period Type: | duration

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- Definition The cumulative amount of depreciation for real estate property held for investment purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(3)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 7 + Details
Name: | us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Carrying amount as of the balance sheet date of improvements having a life longer than one year that were made for the benefit of one or more tenants. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(f)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
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Namespace Prefix: |
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Balance Type: |
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Balance Type: |
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- Details
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